Author Topic: mini sd Card socket pinout Q  (Read 7062 times)

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Offline RuddyCrazyTopic starter

  • Newbie
  • Posts: 6
mini sd Card socket pinout Q
« on: June 07, 2011, 07:16:01 am »
Hi Guy's,
            I'm on making a smd breakout board for a mini SD card socket that suits a micro SD card. The mini socket has 11 pins and after some research I reckon I got it right but I would like to check if the pinouts are correct before I make a board.

Anyway the pinouts I did from the 11 pin mini slot reader to the micro sd card

11 pin___________8 pin
pin 1____________ Pin 1 chip select
pin 2____________Pin 2 DI
pin 3____________Pin 3 Gnd
pins 4,5,6_______N/C
pin 7____________ Pin 4 Vdd
pin 8____________ pin 5 Clock
pin 9____________ pin 6 Gnd
pin 10___________ pin 7 DO
pin 11___________ pin 8 N/C

The card detect is on the side of the socket and I put a trace to ground. Now the write protect isn't on so I do suppose if it's left out it shouldn't be a problem but is it Vdd or ground for write protect ?

Cheers Bryan






 

Offline KeithBrown

  • Contributor
  • Posts: 37
  • Country: ca
Re: mini sd Card socket pinout Q
« Reply #1 on: June 09, 2011, 10:36:42 pm »
What you seem to be referring to is the SPI Signal Interface mode pins. I don't think you have the 11 pin (miniSD) columns correct, and you seem to have different problems with the 8 pin column (microSD). On the miniSD, in the SPI Mode, pins 8 and 9 are Unused and 10 and 11 are reserved (basically means the same thing). Now you say that you are making the board for a miniSD socket "that suits a micro SD card"--I don't follow what you mean here. Are you simply plugging in either a miniSd, or, a microSD in an available adapter (they often come with them) or is there a socket type which will accept either size? Giving us part numbers is always good!

My take on it this (based on what I found at www.interfacebus.com):

MiniSD-11 pin  name -- function  MicroSD-9 pin
      1............CD -- chip select..........2
      2............DI -- MOSI..................3
      3............Vss --Gnd...................6
      4............Vdd --V+....................4
      5............CLK--serial clock..........5
      6............Vss --Gnd
      7............DO -- MISO.................7
      8............unused.......................1
      9............unused
      10...........reserved.....................8
      11...........reserved

Also, are you sure you can omit the card detect: how will software know to set up for a new card or delete buffers etc when a card is removed?
And the Write protect is usually a switch to ground that is activated if and only if the card's write protect slide is in the corresponding position, so to answer that question: ground (probably--but check the socket to be 100 % sure).


 

Offline RuddyCrazyTopic starter

  • Newbie
  • Posts: 6
Re: mini sd Card socket pinout Q
« Reply #2 on: June 13, 2011, 07:25:08 am »
Hi Keith,
           Thanks so much for pointing out the error on the pinouts, I did go and research on that link you gave and YEP you are right. The card detect is the last pin and the square pad. The micro sd card doesn't have a write protect so I'll tie the micro output to Vdd. I made up the board today along with a mini usb type B board and later this week i'll drill and solder both sockets on. Then with a bit more work I'll be ready to program in the maximite code and have my own homebrew version to play with.

Thanks again mate

Cheers Bryan
 


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